Telegraph-insulator



(No Model.) 2 sheets sheet 1.

C. G'. HINSDALE.

TELEGRAPH INSULATOR.

Patented Nov. 6, 1883.

a V V in Illlllllll Ill] 11 liar/622i.

(No Model.) 2 Sheets-Sheet 2. G. O. HINSDALE.

TELEGRAPH INSULATOR.

Patented NOV. 6, 1883.

fave 2250a UNITED STATES PATENT OFFICE.

CHARLES O. HINSDALE, OF CLEVELAND, OI'IIO.

TELEIGRAPH-INSULATOR.

SPECIFICATION forming part of Letters Patent No. 287,830, dated November 6, 1883.

(X0 model.)

T0 (1 whom it may concern.-

Be it known that 1, CHARLES C. IIINSDALE, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented new and useful Improvements in Telegraph-Insulators; and I do hereby declare that the following is a full and complete description thereof.

The nature of this invention relates to that class of telegraph-insulators, usually made of glass, 8:0. for supportinglines ordinarily above ground, and connected with poles and buildings, as is generally done. The said insulator for this purpose is made of pa-penpulp, or pulp composed of vegetable fiber, and formed into the desired shape by molding and compressing the said pulp by mechanical means or otherwise, whereby the said article is shaped for use, and may be employed in place of and in the same relation with telegraph-lines as are the ordinary insulators for that purpose. In order to give solidity, strength, and density to the paper insulator, and-to render the same impervious to the dissolvent action of moisture and the disintegrating influence of the weather, I combine with the pulp of which to make the insulator liquid silica or silicon, and

with or without mineral cement. These ingredients, however, are secondary agents and do not constitute the essential feature of my invention, which consists in making the insulator of pulp composed of any suitable mate rial, and combining therewith the above-specified ingredients, or their equivalents, making a new article of manufacture.

I do not confine myself to any one particular shape of the insulator; but such as is shown in the drawings is of the most approved shape.

Figure 1 represents an external side view of a telegraph-insulator composed of paper-pulp, as above specified, and shown as attached to a stem or holder for fixing the insulator in place. Fig. 2 is a transverse vertical section of the insulator having attached thereto the stem or holder alluded to. Fig. 3 is an end view of the insulator. Fig. 4 is a modification of Fig. 1.

Like letters of reference refer to like parts in the several views.

The preparation of the pulp of which to make the insulator and casting or molding it into shape are as follows:- The pulp material is refiour paste, having mixed therewith the ingredients above specified. Into a foraminous mold, of the proper shape for an insulator, the prepared pulp is forced by hydrostatic pressure. For that purpose is employed a hydrostatic force-pump, by which the pulp is pumped into the mold, and by the power of the pump the water is forced out of the pulp and passes off through the perforations in the mold, leaving the pulp therein in a firmly compact or solid condition, and comparatively a dry paper insulator of the shape of the mold.

It will be observed in Fig. 2 that the insulator is provided with a female screw, A. Said screw is formed by means of a mandrel having thereon a thread. Thus the mold is filled with pulp and compressed therein to a solid condition, as above described, the mandrel is then screwed into the mold and into the paper insulator therein, thereby forming the screwthread A in the insulator. The operation of screwing the mandrel into the insulator in the mold causes an increment of pressure, produc ing a further condensation of the pulp on the screw part of the insulator equal to the diameter of the mandrel, thereby rendering the said screw part of the insulator all the more firm and durable for holding the supporting stem or holder B when inserted therein.

A modification of the above-described meth od of molding the insulator consists in first manipulating the paper-pulp into a crude shape of an insulator and then placing the same in a mold. The screw-mandrel is then screwed into the mold and into the plastic pulp, which is now subjected to a high pressure by any suitable means for expelling the water therefrom, whi ch passes oi'fthrough the foraminous mold, while the pulp is firmly compressed therein and around the screw of the mandrel in nearly a dry condition. The mandrel is then screwed out, leaving a female thread in the insulator, which is then taken from the mold.

In the drawings is represented a stem, 13, screwed into the insulator 0, whereby it is secured in its respective place when in practical use. The insulator, however, may be connected to the stems or holders in ordinary use. The said stem or holder 13 is shown and described as being a separate and distinct thing,

duced to about the consistency of ordinary I to which the insulator is attached. The stem and insulator, however, may be of one piece, as shown in Fig. 4, in which 0 represents the insulator, and B- the stem, the two being formed together in a mold, and both of the same material-viz., paper-pulp. It is preferred to'have the two parts separate, and then to render it a better non-conductor, irrespective of the means that may be employed for its manufacture.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is

1. As a new article of manufacture, a tele-v graphinsulator constructed of paper-pulp, or

a pulp of other fibrous material, substantially as herein set forth, and for the purpose specified.

2. A telegraph insulator constructed of a composition of paper-pulp, or a pulp of other suitable material, and liquid silica or silicon or other equivalent cementing agent, substantially as herein set forth, and for the purpose specified.

3. A telegraph insulator consisting of an insulating -head, 0, and supporting stem or holder B, formed in one piece and constructed of the same material-viz., paper-pulp-substantially as herein set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

' CHARLES C. HINSDALE.

\Vitnesses:

W. H. BURRIDGE, J. H. BURRIDGE. 

